FQAM Encoding Segmentation for Wireless Systems
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Solution Overview
Problem
Existing Frequency and Quadrature-Amplitude Modulation (FQAM) systems face high complexity in channel encoding and decoding, which hinders their ability to achieve Coded Modulation (CM) channel capacity, especially when using non-binary channel codes with large alphabet sizes.
Innovation Solution
The method involves dividing an information bit stream into multiple portions and applying different encoding and decoding schemes for each portion, using a combination of FSK and QAM modulation, with multi-stage encoding and decoding processes to generate and decode FQAM symbols, thereby reducing complexity while approaching CM channel capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FQAM is combined with non-binary channel codes with large alphabet sizes to approach CM channel capacity, then decoding performance is improved, but encoding and decoding complexity increases exponentially
Solution Approach 1:
The information bit stream is divided into multiple portions, with different portions encoded using different channel codes (binary and non-binary). This segmentation allows the system to achieve high decoding performance for critical portions using non-binary codes while maintaining lower complexity for other portions using binary codes, thus resolving the contradiction between performance and complexity.
Solution Approach 2:
Different encoding schemes are applied to different portions of the bit stream based on their importance or characteristics. Critical portions requiring higher reliability use non-binary channel codes with large alphabet sizes, while less critical portions use simpler binary codes, optimizing the overall system performance-to-complexity ratio.
2Quantity of substance
If FQAM is used to make interference signal non-Gaussian for higher channel capacity, then channel capacity increases, but the system becomes unsuitable for bit-to-symbol scheme requiring complex encoding
Solution Approach 1:
The bit stream is segmented into multiple portions that are processed through different encoding paths. Some portions are encoded using schemes compatible with FQAM's non-Gaussian characteristics, while others use more traditional approaches, allowing the system to achieve high channel capacity without requiring all portions to handle the full complexity of non-Gaussian modulation.
Solution Approach 2:
The patent introduces intermediate processing stages that bridge the gap between FQAM's non-Gaussian nature and traditional bit-to-symbol mapping. By using multi-stage encoding with intermediate representations, the system can leverage FQAM's capacity advantages while managing the complexity through structured intermediate steps.
Data Source
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AI summary
An apparatus and a method for operating a transmission end in a wireless communication system that supports Frequency and Quadrature-Amplitude Modulation (FQAM) are provided. The method includes dividing an information bit stream into a plurality of portions, encoding each of the plurality of portions using different encoding schemes, and generating an FQAM symbol by combining result values of the encoding of each of the plurality of portions, wherein the encoding schemes are different according to at least one of an encoding order, an encoding rate, an input size, and an encoding technique.